单臂电桥平衡时，两个相对桥臂上电阻的乘积等于另外两个相对桥臂上电阻的乘积。( )
参考答案：对
I don’t know _________, but I guess he may be a doctor.
A．what is he
B．how he does
C．what he is
D．what does he do
热处理裂纹，锻造折叠，磨削裂纹等称为（）工艺缺陷。
